Basic Metals, Inc Standard Sizes

Galvannealed steel is created by a hot-dip coating process. The process produces a uniform zinc coating on both sides of the product. Immediately after the hot-dip process, the metal is exposed to a heat treatment that allows the iron from the base metal to further diffuse into the zinc, creating a zinc-iron alloy layer.

This results in the non-spangled finish, unlike galvanized steel. The matte finish makes the material suitable for painting.